Beating engine



Nov. 20, 1923. 1,474,442

W. RABUS BEATING ENGINE Filed July 17, 1914 wz'inegsjes b fiweizior; MM; %K/W 9 Arr 'y.

Patented Nov. 20, 1923.

um'rao STATES PATENT OFFICE.

WILHEIIM RABUS, F KARLSTAD, SWEDEN, ASSIGNOR TO ROBERT J. m, 0]?

LONDON, ENGLAND.

Bumme- ENGINE.

Application filed July 17,

-circuit. Hitherto these machines as a rule consisted of an oblong or oval trough divided by a partition into-two channels or passages. This method of construction had the drawback that more particularly at the merging point between the two passages formed by the'central partition accelerations and retardations of the stuff took place owing to the reversal of the direction of flow of the pulp vWherebv also the circulation inthe engine was reduced and became'irregu- Such drawbacks are obviated and material improvements are obtained by the present invention. Thecourse or channel of my new beater through which the stuff is circulated has a uniform fall or gradient from beginning to end; It has a spiral form or substantially so and in cross-section is substantially U-shaped in that its bottom is dished and its walls straight. The spiral channel forms a uniformly curved path-for the stuff, giving the stuff a uniflow direction of travel uninterrupted by obstructions and therefore, its flow is eddyless. The movement of the stuff is thereby made uniform throughout the whole cross section of the dished portion of the channel from the point where it issues from the beater roll to that where it re-enters the roll. In this manner it becomes possible to treat stuff of greater density than hitherto and to considerably increase the speed of circulation.

The invention is illustrated by way of example in the accompanying drawings, in which: a

Fig. 1 is a lateralview and Fig. 2 a plan view of a beating engine constructed according to this invention.

1914. Serial No. 851,576.

Fig. 3 shows on a slightly reduced scale 7 the channel developed in longitudinal section.

In the constructional-form of the machine shown the beater roll 5- rotates in a boxsha ed extension ,9 of the channel a. Whereas hitherto the channel was as a rule c'ontamed in an oblong or oval shaped enclosure according to this invention the channel a has a spiral form as shown more particularly in Fig. 2. A vertical central partition 0 which is suitably curved so that it forms a substantially annular mid-"feather, divides the course of flow into two parts (1 and f of approximately semi-circular spiral shapethrough which the stuff is caused constantly" to circulate; By the spiral shape of the channel an entirely uniform circulation is attained since the stuff follows a continuously curved path free from any obstruction in contra-distinction to. the action which takes place in ordinary troughs in which at the merging point between the passages d and f alternating accelerations and retardations of the pulp can not be avoided.

In order to further increase the uniformity and rapidity of circulation, the channel is given a uniform gradient along its whole annular extent as shown in Fig. 3. The gradient extends from the point at which the stuff enters the spiral channel on leaving the beater roll 2' almost down to the point at which it re-enters the roll whereby the speed of circulation in the engine is increased, so as, to permit efiicient treatment of the stufl at greater densities.

In order to ensure a thorough mixing of the stufi, the spiral channel as shown more particularly in Fig. 2 is provided immediately in front of the beater roll where the stuff is discharged into the channel by a short partition k which divides the beginning of the channel into two streams.

The result of this arrangement is that the a stream of stuff which has travelled round the outer lineof the channel, on its return to the beater roll is discharged into the passage Z and thereby is constructed against the inner line 0. The shape given to the latter and the influence of the partition 76 direct this stream outwardly across the width of the channel, causing it to be thoroughly mixed with the stream of stufi which during its previous circuit has travelled along the inner line of the channel and which issues from the passage 1):.

The stuff delivered from the roll is more of amass than a fluid and therefore its flow or more properly, its bodily movement along the channel for conveying it from the top of the roll to or adjacent to the bottom of the roll,"1nust be facilitated or accelerated as much as possible. To that end, I desire to use the weight and pressure of the stuff delivered from the roll to accelerate or urge or impel the stufl' along and that a minimum of friction may be produced in the passage of the stuff through the channel, the stuff to pass through a single continuous spiral channel having a uniform incline or gradient and whose width progressively increases.

Thatthe acceleration or urge of the stock may be effectively produced, ll curve or so shape the partition Z: and the similar part of the partition 0 that either of them form a. deflecting element for the stock, that is, their outline in plan View taken with the exit or outlet from the beater roll appears cowl-like. Such a deflector (and I may use one or both of them) being closed at one end, directs the stufl in one direction only and by their main walls at an acute angle to the beater roll delivery, the stuff delivered from the roll backs up against the deflecting partitions where, due to their 1 ,amaaa angularity, it is wedged or urged along, all the while adding its Wei ht and pressure to the stuff in the channe to accelerate its movement.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that What I claim is 1. In combination in a beating engine, a heater roll for beating and elevating the stuff, a single substantiall nous, channel having a unif drm gradient for conveying, with a minimum of friction, the stufi' from adjacent the top of the roll to a point adjacent the bottom of the roll, and deflecting means for diverting thestutt' from the top of the roll into said channel and accelerating the flow thereof through said channel in order to .ass the stufi' through the channel eddyless ly, whereby the stuff may be Worked While in less fluid condition than heretofore.

2. The apparatus of claim 1, in which the deflecting means is curved in adirection transverse to the direction of stuff flow as it comes from the roll.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WHJHEJUM RAUS.

Witnesses:

Fauna. NoimsJo, MARTIN KRAFT.

spiral, contin- 

